Direct-acting engine



(No Model) W. D. HOOKER.

DIRECT ACTING ENGINE.

No. 585,630. Patented June 29,1897.

NITED STATES WILLIAM DAVIS HOOKER, OF CHICAGO, ILLINOIS.

DIRECT-ACTING ENGINE.

SPECIFICATION forming part of Letters Patent No. 585,630, dated June 29, 1897. Application filed November 19,1896. serial No. 612,779. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM DAVIS H0010 ER, a citizen of the United States, residing at Chicago, in the county'of Cook and State of Illinois, have invented a new and useful Improvement in Direct-Acting Steam-Engines, of which the following is a specification.

My invention relates to improvements in direct-actin g steam-engines in which the main valve is driven and arrested by steam. The essential features of the mechanism which I employ in the present invention are found in a patent granted to me for improvements in direct-acting steam-engines dated December 6, 1870, No. 109,904, in which puppet-valves are shown in supplemental piston to admit live steam to drive the supplemental piston and with it the main valve of the engine and arresting and cushioning it on the exhaust steam or atmospheric pressure; also, patent granted to me for improvements in directacting steam-engines dated July 16, 1872, No. 129,345, in which ports in the supplemental piston and ports in said piston valve chest are so arranged that live steam will be supplied through these ports when the piston is near the end of its strokes to arrest and cushion the piston on compressed live steam; and the object of my present invention is to so combine these inventions in one engine that the supplemental piston and with it the main valve shall be driven by live steam supplied by both the supplemental valve and supplemental piston, the supplemental piston supplying live steam from the valve-chest to arrest the said piston on compressed live steam, thereby getting a quick motion of the said piston and a powerful steam-cushion to positively prevent it from striking its cylinder heads.

Referring to the accompanying drawings, similar letters indicate like parts which I consider the best means for carrying the invention into practice.

Figure 1 is a longitudinal vertical section taken on line a a. Fig. 2 is an end elevation of the engine and valve-chest.

A represents a steam-cylinder; B, a piston therein; 0, the piston-rod D, the main valve for controlling the admission of steam to and its exhaust from the steam-cylinder; E, the valve-chest of engine; F, the supplemental piston; g g, puppet-valves in the endsof said piston to close ports h h to cushion the sup plemental piston on compressed live steam when the ports h h are covered by puppetvalves g y; it, ports in supplemental piston, through which live steam from the steamchest is admitted to ports j j, leading to the ends of steam-chest after the puppet-valves g 9 have closed the ports h h just before the piston reaches the cylinder-heads G G, thereby arresting the said piston on compressed live steam, and there will be no danger of the piston striking the valve-chest heads, which often occurs when the puppet-valves g g only are employed, as shown in my patent of December 6, 1870. When, as in my patent of July 16, 1872, the ports a 7 in supplemental piston and ports j j in valve-chamber only are employed, if the piston were at or near the cylinder-heads the live steam supplied by the supplemental valve H through ports h It could not get behind the ends of supplemental piston to start it, as, the ports j j being covered by the supplemental piston, the

said piston would start slowly or not at all;

but when both the puppet-valves g g" in supplemental piston F are used, together with the ports '5 c" in said piston and ports jj in valve-chest E, live steam controlled by the supplemental valve will pass by the puppetvalves 9 g and behind the ends of supplemental piston F, giving the full power of the steam to drive the piston. As the puppetvalves close the exhaust-ports h h, the live steam from the steam-chest will be supplied through ports i t" and j j behind the ends of the piston F, and then, the ports '5 v1 passing over and closing ports j j, the live steam will be confined between the ends of the supplemental piston and valve-chest heads and the piston will be arrested on compressed live steam. I is the supplemental-valve chest, and J, the supplemental-valve rod. This supplemental valve Il may beconnected to the main piston B by any suitable valve movement so arranged as to reverse the valve II when the main piston is near the termination of its strokes.

What I claim, and desire to secure by Letters Patent, is

The combination With the supplemental piston F, having puppet-valves g, 9, ports h, h, supplemental valve H, of the ports vi, 1', in supplemental piston F, and portsj j, in

Valve-chest E, and a valve-movement connecting the main piston to valve H, substanl0 tially as described and for the purpose set forth.

WILLIAM DAVIS HOOKER. \Vitnesses:

WM. F. HENNING, WM. M. RHEEM. 

